Senior Software Development Engineer, Loyalty - Full Stack

At Expedia Group, we help travelers explore the world, one journey at a time. As a global travel company powered by passionate people, trusted partnerships, and leading technology, we connect travelers, partners, and advertisers through our consumer brands, B2B network, and travel advertising business. Here, you'll do meaningful work that helps millions of people discover, book, and experience travel with more ease, confidence, and joy. Our five Behaviors-Traveler First, Think Big, Operate with Excellence, Ownership Mindset, and Succeed Together-help foster a supportive environment where people can grow their careers and have the flexibility, benefits, and support to do their best work. Join us and build for travelers everywhere. Introduction to the Team:    Expedia Technology teams partner with our Product teams to create innovative products, services, and tools to deliver high-quality experiences for travelers, partners, and our employees. A singular technology platform powered by data and machine learning provides secure, differentiated, and personalized experiences that drive loyalty and traveler satisfaction.    The Loyalty Engineering organization powers continuous engagement, re-engagement, and re-acquisition for travelers worldwide. We build the systems that create a durable growth flywheel for Expedia, deepening traveler relationships while driving measurable business impact across brands and markets.  In this role, you will contribute to the technical strategy and architecture for the AI-empowered Loyalty charter — developing and delivering next-generation, intelligent engagement experiences powered by modern AI and agentic systems. You will contribute to system design across multiple distributed engineering teams, partnering closely with Product, Data Science, and platform leaders to build scalable, reliable, and innovative solutions.  In this role, you will: Design, build, and evolve full stack services and web experiences for global loyalty products, ensuring high availability, scalability, and performance across multiple customer and partner touchpoints. Lead end-to-end system design, including low-level design, API design, and data modeling, to create maintainable, secure, and extensible solutions that align with loyalty platform architecture. Own complex features and services across the stack from technical design through implementation, testing, deployment, and operational support, driving high engineering standards and code quality. Collaborate with product, design, and cross-functional engineering teams to translate loyalty product requirements into technical solutions, making pragmatic trade-offs using data and customer impact. Safely integrate and operate AI/ML‑enabled solutions that improve outcomes, including personalization, experimentation, or optimization capabilities within loyalty experiences and services. Contribute to best practices, tooling, and engineering processes that enable reuse and fungibility across multiple domains and services within the loyalty ecosystem.

Bachelor’s degree in Computer Science or a related technical field; or Equivalent related professional experience. 8+ years of relevant professional experience. Professional software development experience building and operating full stack or backend services, including hands-on work with APIs, data models, and web applications. Proven experience owning design and implementation for services or features within a multi-service or domain environment, including accountability for quality, reliability, and operational readiness. Strong proficiency in at least one modern programming language and associated frameworks, with the ability to design, review, and debug complex, distributed systems. Familiarity with AI-driven systems, tools, or workflows and applying AI/ML concepts to real world products.

Experience designing and evolving large‑scale, customer‑facing